Results 71 to 80 of about 4,264 (203)

Advancements in wearable heart sounds devices for the monitoring of cardiovascular diseases

SmartMat, Volume 6, Issue 1, February 2025.
This article presents the recent advancements in wearable and flexible heart sound devices, focusing on their mechanics, types of sensors, flexible sensing materials, and prospective denoising techniques. Furthermore, the potential applications of heart sounds for the monitoring of cardiovascular diseases are reviewed as well along with its future ...
Rafi u Shan Ahmad, Muhammad Shehzad Khan, Mohamed Elhousseini Hilal, Bangul Khan, Yuanting Zhang, Bee Luan Khoo   +5 more
wiley   +1 more source

Fabrication and electrical characteristics of flash-sintered SiO2-doped ZnO-Bi2O3-MnO2 varistors

Journal of Advanced Ceramics, 2020
The dense ZnO-Bi2O3-MnO2-xSiO2 (ZBMS) varistors for x = 0, 1, 2, 3 wt% were fabricated by flash sintering method under the low temperature of 850 °C within 2 min. The sample temperature was estimated by a black body radiation model in the flash sintering
Pai Peng, Yujun Deng, Jingpeng Niu, Liyi Shi, Yunzhu Mei, Sanming Du, Juan Liu, Dong Xu   +7 more
doaj   +1 more source

Mechanism and suppression of breaking overvoltage of DC circuit breakers

High Voltage, Volume 10, Issue 1, Page 32-46, February 2025.
Abstract The occurrence of breaking overvoltage in a DC circuit breaker (DCCB) poses a potential threat to the safe operation of a DC grid. Based on the structure of the ±10 kV three‐terminal DC distribution network, this paper sets up the medium‐voltage DCCB and formulates a fault protection strategy.
Lu Qu, Zhangqing Yu, Zhizheng Gan, Xin Yan, Cheng Jiang, Yulong Huang, Mingshen Li, Jian Feng   +7 more
wiley   +1 more source

Research on influence of double energy absorptions on dynamic volt‐ampere characteristics of metal oxide varistors

High Voltage, Volume 10, Issue 1, Page 78-87, February 2025.
Abstract Metal oxide varistors (MOVs) are extensively employed in DC circuit breakers (DCCBs) to suppress overvoltage, dissipate energy and build up voltage after interruption. Despite their widespread use, the performance of MOVs under short‐time, double energy absorption conditions is not well understood, posing a challenge to their application in ...
Chen Long, Yifei Wu, Yi Wu, Mingzhe Rong, Yu Xiao, Yunfan Bai   +5 more
wiley   +1 more source

Influence of processing on microstructure and electrical characteristics of multilayer varistors

Journal of Advanced Ceramics, 2019
The paper reports on the influence of processing on microstructure and electrical properties of multilayer varistors based on zinc oxide doped with Bi2O3, Sb2O3, Co2O3, MnO, Cr2O3, B2O3, and SiO2.
D. Szwagierczak, J. Kulawik, A. Skwarek
doaj   +1 more source

Summary of the second workshop on liquid argon time projection chamber research and development in the United States [PDF]

, 2015
The second workshop to discuss the development of liquid argon time projection chambers (LArTPCs) in the United States was held at Fermilab on July 8-9, 2014.
, , , , , , , , , , , , , , , A. Badertscher ., A. Badertscher ., A. Badertscher ., A. Blatter ., A. Ereditato ., A. Hahn, A. Marchionni, B. Baller, B. Baller ., B. Carls, B. Rebel, B.J.P. Jones, B.J.P. Jones ., B.J.P. Jones ., C. Anderson ., C. Bromberg, C. Hagmann, C. Mauger, C. Montanari, C. Thorn, C.G. Wahl, CAPTAIN collaboration, D. Artrip, D. Whittington, D.W. Swan, DarkSide collaboration, F. Bay ., F. Cavanna, G. Deptuch, G. Petrillo, G. Sinins, H. Chen, H. Olling Back, H. Wang, ICARUS collaboration, J. Asaadi, J. Raaf, J. Urheim, K. Lang, K. Terao, L. Epprecht, L.F. Bagby ., LAPPD collaboration, LArIAT collaboration, LBNE collaboration, M. Adamowski, M. Adamowski ., M. Auger ., M. Johnson, M. Nessi, M. Soderberg, M. Stancari, M. Szydagis ., M. Toups, M. Weber, MicroBooNE collaboration, N.J.C. Spooner, NOvA collaboration, R. Acciarri, R. Dharmapalan, R. Van de Water, R. Wasserman, S. Lockwitz, S. Mufson, S. Pordes, T. Briese ., T. Junk, T. Strauss, T. Tope, T. Yang, W. Foreman, WArP collaboration   +86 more
core   +3 more sources

The mathematics of varistors

European Journal of Applied Mathematics, 2016
A three-dimensional model of the varistor device is proposed. The thermal and electric conductivity of the material are taken to depend, in addition to the electric potential, on the temperature. Two theorems of existence and uniqueness of solutions for the boundary-value problem which determine the potential and the temperature inside the device are ...
openaire   +1 more source

Kinetics deformation of current-voltage characteristics of the varistor oxide structures due to overcharging of the localized states

Tekhnologiya i Konstruirovanie v Elektronnoi Apparature, 2014
Prolonged exposure of zinc oxide varistors to the electrical load leads to current-voltage characteristics (CVC) deformation, which is associated with a change in the height and width of the intergranular barriers, which are the main structural element ...
A. S. Tonkoshkur, A. V. Ivanchenko
doaj   +1 more source

Stability of microprocessor relay protection and automation systems against intentional destructive electromagnetic impacts. Part 2 [PDF]

, 2011
Problems of impact of the electromagnetic high-power pulses generated at nuclear explosion or by means of the special equipment, intended specially for damage of the electronic equipment, in particular digital protective relays and automatic systems ...
Gurevich, V. I.
core   +3 more sources

A first principles study of wurtzite-structure MnO [PDF]

, 2003
We present results of a density functional theory study of MnO in the wurtzite structure. Our motivation is provided by recent experiments reporting ferromagnetism in Mn-doped wurtzite structure ZnO.
Gopal, Priya, Spaldin, Nicola, Waghmare, Umesh. V.   +2 more
core   +2 more sources